/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.visitor;

import proguard.classfile.Clazz;
import proguard.classfile.constant.*;
import proguard.classfile.constant.visitor.ConstantVisitor;
import proguard.classfile.util.*;

/**
 * This ConstantVisitor lets a given ClassVisitor visit all the referenced classes that are returned by the invoke
 * dynamic constants that it visits.
 *
 * @author Eric Lafortune
 */
public class DynamicReturnedClassVisitor extends SimplifiedVisitor implements ConstantVisitor {
    protected final ClassVisitor classVisitor;

    public DynamicReturnedClassVisitor(ClassVisitor classVisitor) {
        this.classVisitor = classVisitor;
    }

    // Implementations for ConstantVisitor.

    public void visitAnyConstant(Clazz clazz, Constant constant) {}

    public void visitInvokeDynamicConstant(Clazz clazz, InvokeDynamicConstant invokeDynamicConstant) {
        // Is the method returning a class type?
        Clazz[] referencedClasses = invokeDynamicConstant.referencedClasses;
        if (referencedClasses != null && referencedClasses.length > 0 && ClassUtil
            .isInternalClassType(ClassUtil.internalMethodReturnType(invokeDynamicConstant.getType(clazz)))) {
            // Let the visitor visit the return type class, if any.
            Clazz referencedClass = referencedClasses[referencedClasses.length - 1];
            if (referencedClass != null) {
                referencedClass.accept(classVisitor);
            }
        }
    }
}
